Librería Samer Atenea
Kálamo Books
Librería Elías (Asturias)
Librería Kolima (Madrid)
Librería Proteo (Málaga)
You are encouraged to do some brain exercises daily. A brain exercise that you can do is Sudoku. This book has a variety of puzzles that range from easy to difficult. Sudoku helps boost logic, re-focus skills and memory. It helps you break routine by emptying your mind and filling it with numbers and patterns. Get a copy today.